165 165÷2×0.78 46±5.29等于多少？正负5.29是多少

45.99+0.78×(1.64+1.54)÷2±5.29等于多少？

解：

45.99+0.78×(1.64+1.54)÷2

=45.99+0.78×3.18÷2

=45.99+1.2402

=47.2302

所以，

45.99+0.78×(1.64+1.54)÷2±5.29

=47.2302±5.29

=52.5202或41.94.2

7.85+0.75×（165+157)÷2±5.29cm

=7.85+3/4×322÷2±5.29

=7.85+3/4×161±5.29

=7.85+120.75±5.29

=128.6±5.29=133.89

或=123.31

45.99 ＋0.78×＜163+158＞÷2

=171.18

45.99 ＋0.78×＜163+158＞÷2±5.29=171.18±5.29

=165.89到176.47之间

45.99+0.78×（1.75+1.64）÷2+（-5.29）

=45.99+0.78×3.39÷2-5.29

=45.99+2.6442÷2-5.29

=45.99+1.3221-5.29

=45.99-5.29+1.3221

=40.7+1.3221

=42.0221